What can the US do? What can the US do? Is that question serious?
This is a United States Navy Warship, in international waters, with a Russian fighter jet 75 feet above the ship. If we are not going to do anything about that than what event are we going to react to?
What you do is you shoot the plane out of the sky. Remember what Turkey did when Russia flew over their border without permission? They shot the plane out of the sky. That solved the problem. You don't hear about Russian jets flying over Turkey anymore.
This is a staring contest and the USA keeps blinking. Stop blinking and start shooting.
Putin is a bully. You punch a bully in the nose. That is the only thing they understand.